Why is science just a starting point and not an end point?

To what end? If I am going to need to listen to the audio equipment to decide how it sounds, what possible value does the results obtained from test tones give me?

Test tones can show distortion and noise better than music. Test tones are well chosen to stress the device under test. How much value you get from it is up to you. 

An interesting article pertaining to the "know-all's" on the forum.  Scientism | Psychology Today

An interesting article pertaining to the "know-all’s" on the forum. Scientism | Psychology Today

Very interesting thanks....

I read it now....

And i must say at the end that all he say is truthful...

 

Measurements and technology is science, not all science is theoretical it's also practical.  Scientists use measurements and technology all the time to test theories and in audio to test what they hear. For instance Lars Risbo when developing a new driver found inconsistent measurements so along with his colleagues they decided they weren't measuring the right things. Did they throw their hands up and say well we can't measure everything we hear? No, they went about designing tests to find out why and came up with new tests that explained and showed where the problem was in order to go about resolving it. Science, it's why we can communicate over long distances and listen to recorded music in the first place. 

Pedro, science has not failed at all. 

The most significant factor contributing to the sound of the speaker is it's frequency response in your room. Next would be it's dispersion/radiation pattern. IMHO every audiophile should have a calibrated microphone and the appropriate computer program to run some basic tests. This is the one I use  https://www.parts-express.com/Dayton-Audio-OmniMic-V2-Acoustic-Measurement-System-390-792
I am extremely happy with it. It is simple to use, very accurate and the program has some very useful added features like an oscilloscope.
In 30 seconds you can see exactly what your speakers/room are doing.
You can manage problems by moving speakers, with various acoustic treatments and finally with digital EQ. It is always useful to start with a flat system which means +- 5 dB, yup 5 dB.  Your system is lucky to be +- 10 dB! +- 1 dB would be amazing but you will never get there without digital EQ/room control. Once you have flat then you can adjust things to your liking. 
Next you can impulse test the system to make sure all speakers and drivers are aligned.  
Not only can you make your system way better but you can learn a lot about acoustics. This is an amazing value at  $300.00 There is not other "tweak" that is as powerful. It is so powerful it is not a tweak. It is essential.